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[198.145.29.99]) by mx.google.com with ESMTPS id a16si15952922pju.24.2019.07.15.14.25.25 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Jul 2019 14:25:25 -0700 (PDT) Received-SPF: pass (google.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=T1RtYY+H; spf=pass (google.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org Received: from localhost.localdomain (c-73-223-200-170.hsd1.ca.comcast.net [73.223.200.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 78B7C206B8; Mon, 15 Jul 2019 21:25:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563225925; bh=gu5L//UCY90oTE7oYavnazchCMSkZepvdlSpPTeCuZw=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=T1RtYY+HJJpAjuysHg6gP4dkiE3BuBBpABr+5IMyGEe+QCozDkKo/h9T7kyeJvsot PvYU7YEfvM1NzcVoTs8luyeDs0HtS3POfO5V5adbDYe36go1azq2HGUuxRY3lPjCvW e75m9JKCKAVlIgZGP9gKdktG2zvG/KTsYn/om7gs= Date: Mon, 15 Jul 2019 14:25:24 -0700 From: Andrew Morton To: howaboutsynergy@pm.me Cc: bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org, Mel Gorman Subject: Re: [Bug 204165] New: 100% CPU usage in compact_zone_order Message-Id: <20190715142524.e0df173a9d7f81a384abf28f@linux-foundation.org> In-Reply-To: References: X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Sat, 13 Jul 2019 19:20:21 +0000 bugzilla-daemon@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=204165 > > Bug ID: 204165 > Summary: 100% CPU usage in compact_zone_order Looks like we have a lockup in compact_zone() > Product: Memory Management > Version: 2.5 > Kernel Version: 5.2.0-g0ecfebd2b524 > Hardware: x86-64 > OS: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Page Allocator > Assignee: akpm@linux-foundation.org > Reporter: howaboutsynergy@pm.me > Regression: No I assume this should be "yes". Did previous kernels exhibit this behavior or is it new in 5.2?